2018 heat emission from EnergyPlus simulation at finer grid level normalized by grid size, check outlier
Yujie Xu
8/15/2022
Diurnal Profile
## Reading layer `wrf-grids-origin' from data source
## `/Users/yujiex/Dropbox/workLBNL/EESA/code/im3-wrf/high res grid for reporting/wrf-grids-origin.geojson'
## using driver `GeoJSON'
## Simple feature collection with 130176 features and 4 fields
## Geometry type: POLYGON
## Dimension: XY
## Bounding box: xmin: -119.0324 ymin: 33.09492 xmax: -116.8525 ymax: 34.76695
## CRS: 4326The following are the definition of heat emission components.
| variable | EnergyPlus output |
|---|---|
| emission.exfiltration | Environment:Site Total Zone Exfiltration Heat Loss [W/m2](Hourly) |
| emission.exhaust | Environment:Site Total Zone Exhaust Air Heat Loss [W/m2](Hourly) |
| emission.ref | SimHVAC:Air System Relief Air Total Heat Loss Energy [W/m2](Hourly) |
| emission.rej | SimHVAC:HVAC System Total Heat Rejection Energy [W/m2](Hourly) |
| emission.surf | Environment:Site Total Surface Heat Emission to Air [W/m2](Hourly) |
The following shows the daily heat emission in the original scale. We can see a lot of large outliers. This indicates a large variability across different grid cells (500m x 500m).
## Warning: Missing column names filled in: 'X1' [1]
The ones with larger than 100W/m2 hourly solar radiation during day time (9am to 4pm) concentrated on grid cells with heavy, light manufacturing facilities and warehouses.
| building.type | vintage | building.area.m2 |
|---|---|---|
| heavy manufacturing | 1981-2008 (2004) | 398985.062 |
| light manufacturing | 1981-2008 (2004) | 101967.597 |
| heavy manufacturing | after 2008 (2013) | 50627.434 |
| warehouse | 1981-2008 (2004) | 28296.690 |
| heavy manufacturing | before 1980 | 14487.476 |
| warehouse | after 2008 (2013) | 8155.134 |
| light manufacturing | before 1980 | 4692.100 |
The ones with night time heat emission greater than 50W/m2 are also mainly from heavy and light manufacturing (the top 6 in total area among the grid cells with large night time heat emission).
| building.type | vintage | building.area.m2 |
|---|---|---|
| heavy manufacturing | 1981-2008 (2004) | 672533.1067 |
| light manufacturing | 1981-2008 (2004) | 143716.7645 |
| warehouse | 1981-2008 (2004) | 86848.0295 |
| warehouse | before 1980 | 71676.1589 |
| heavy manufacturing | after 2008 (2013) | 50627.4343 |
| light manufacturing | before 1980 | 33405.1678 |
| multi-family | before 1980 | 24634.4788 |
| heavy manufacturing | before 1980 | 18951.7858 |
| warehouse | after 2008 (2013) | 8155.1336 |
| small single-family | before 1980 | 6630.8304 |
| primary school | 1981-2008 (2004) | 5689.4747 |
| multi-family | 1981-2008 (2004) | 3378.4943 |
| small hotel | 1981-2008 (2004) | 2454.6038 |
| large single-family | before 1980 | 2073.8996 |
| religious | before 1980 | 408.2026 |
| multi-family | after 2008 (2013) | 302.5753 |
| large single-family | 1981-2008 (2004) | 154.6785 |
| small single-family | 1981-2008 (2004) | 71.6259 |
The building with highest annual heat emission per building area are heavy manufacturing and full service restaurant. They also have high energy use intensity.
The ratio is computed for each idf-epw combination. The plot shows the average across all different weather inputs. Single-family, multi-family, warehouse, and small office have the largest heat-to-energy ratio. Even if the manufacturing facility is adapted from warehouse model, they don’t have the same high heat-to-energy ratio as warehouse.
The ratio has pretty large variability for single family and warehouses. Although some of the low variability might be hidden from the fact that some building types don’t exist in some grid cells.
